yes , if you know the technique definitely but you require consistent effort without long breaks for at least 4 months for 1 hour a day and taking classes definately help in making you consistent in your work and you feel motivated.

Yes, typewriter is mechanical device and keyboard is electronic device, there is no option for backspace in typewriter.

Sandeep Munjal | 17/12/2015

Typewriter is in itself is a machine used for typing with its own mechanism of striking on paper with the ribbon ink. Here , you require to adjust paper by your own and give space after designated space by moving the machines platen (the upper portion) . The pattern of keys is same as of keyboard but structurally they differently arranged. it requires more maintenance and skill than keyboard user.
Keyboard is a simple hardware device used for typing (providing input) requires to be attached with some input device .